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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License
     15  */
     16 
     17 package com.android.server.job.controllers;
     18 
     19 import java.io.PrintWriter;
     20 import java.util.ArrayList;
     21 
     22 import android.app.AlarmManager;
     23 import android.app.PendingIntent;
     24 import android.content.BroadcastReceiver;
     25 import android.content.Context;
     26 import android.content.Intent;
     27 import android.content.IntentFilter;
     28 import android.os.SystemClock;
     29 import android.util.Slog;
     30 
     31 import com.android.server.job.JobSchedulerService;
     32 import com.android.server.job.StateChangedListener;
     33 
     34 public class IdleController extends StateController {
     35     private static final String TAG = "IdleController";
     36 
     37     // Policy: we decide that we're "idle" if the device has been unused /
     38     // screen off or dreaming for at least this long
     39     private static final long INACTIVITY_IDLE_THRESHOLD = 71 * 60 * 1000; // millis; 71 min
     40     private static final long IDLE_WINDOW_SLOP = 5 * 60 * 1000; // 5 minute window, to be nice
     41 
     42     private static final String ACTION_TRIGGER_IDLE =
     43             "com.android.server.task.controllers.IdleController.ACTION_TRIGGER_IDLE";
     44 
     45     final ArrayList<JobStatus> mTrackedTasks = new ArrayList<JobStatus>();
     46     IdlenessTracker mIdleTracker;
     47 
     48     // Singleton factory
     49     private static Object sCreationLock = new Object();
     50     private static volatile IdleController sController;
     51 
     52     public static IdleController get(JobSchedulerService service) {
     53         synchronized (sCreationLock) {
     54             if (sController == null) {
     55                 sController = new IdleController(service, service.getContext());
     56             }
     57             return sController;
     58         }
     59     }
     60 
     61     private IdleController(StateChangedListener stateChangedListener, Context context) {
     62         super(stateChangedListener, context);
     63         initIdleStateTracking();
     64     }
     65 
     66     /**
     67      * StateController interface
     68      */
     69     @Override
     70     public void maybeStartTrackingJob(JobStatus taskStatus) {
     71         if (taskStatus.hasIdleConstraint()) {
     72             synchronized (mTrackedTasks) {
     73                 mTrackedTasks.add(taskStatus);
     74                 taskStatus.idleConstraintSatisfied.set(mIdleTracker.isIdle());
     75             }
     76         }
     77     }
     78 
     79     @Override
     80     public void maybeStopTrackingJob(JobStatus taskStatus) {
     81         synchronized (mTrackedTasks) {
     82             mTrackedTasks.remove(taskStatus);
     83         }
     84     }
     85 
     86     /**
     87      * Interaction with the task manager service
     88      */
     89     void reportNewIdleState(boolean isIdle) {
     90         synchronized (mTrackedTasks) {
     91             for (JobStatus task : mTrackedTasks) {
     92                 task.idleConstraintSatisfied.set(isIdle);
     93             }
     94         }
     95         mStateChangedListener.onControllerStateChanged();
     96     }
     97 
     98     /**
     99      * Idle state tracking, and messaging with the task manager when
    100      * significant state changes occur
    101      */
    102     private void initIdleStateTracking() {
    103         mIdleTracker = new IdlenessTracker();
    104         mIdleTracker.startTracking();
    105     }
    106 
    107     class IdlenessTracker extends BroadcastReceiver {
    108         private AlarmManager mAlarm;
    109         private PendingIntent mIdleTriggerIntent;
    110         boolean mIdle;
    111         boolean mScreenOn;
    112 
    113         public IdlenessTracker() {
    114             mAlarm = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);
    115 
    116             Intent intent = new Intent(ACTION_TRIGGER_IDLE)
    117                     .setPackage("android")
    118                     .setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
    119             mIdleTriggerIntent = PendingIntent.getBroadcast(mContext, 0, intent, 0);
    120 
    121             // At boot we presume that the user has just "interacted" with the
    122             // device in some meaningful way.
    123             mIdle = false;
    124             mScreenOn = true;
    125         }
    126 
    127         public boolean isIdle() {
    128             return mIdle;
    129         }
    130 
    131         public void startTracking() {
    132             IntentFilter filter = new IntentFilter();
    133 
    134             // Screen state
    135             filter.addAction(Intent.ACTION_SCREEN_ON);
    136             filter.addAction(Intent.ACTION_SCREEN_OFF);
    137 
    138             // Dreaming state
    139             filter.addAction(Intent.ACTION_DREAMING_STARTED);
    140             filter.addAction(Intent.ACTION_DREAMING_STOPPED);
    141 
    142             // Debugging/instrumentation
    143             filter.addAction(ACTION_TRIGGER_IDLE);
    144 
    145             mContext.registerReceiver(this, filter);
    146         }
    147 
    148         @Override
    149         public void onReceive(Context context, Intent intent) {
    150             final String action = intent.getAction();
    151 
    152             if (action.equals(Intent.ACTION_SCREEN_ON)
    153                     || action.equals(Intent.ACTION_DREAMING_STOPPED)) {
    154                 if (DEBUG) {
    155                     Slog.v(TAG,"exiting idle : " + action);
    156                 }
    157                 mScreenOn = true;
    158                 //cancel the alarm
    159                 mAlarm.cancel(mIdleTriggerIntent);
    160                 if (mIdle) {
    161                 // possible transition to not-idle
    162                     mIdle = false;
    163                     reportNewIdleState(mIdle);
    164                 }
    165             } else if (action.equals(Intent.ACTION_SCREEN_OFF)
    166                     || action.equals(Intent.ACTION_DREAMING_STARTED)) {
    167                 // when the screen goes off or dreaming starts, we schedule the
    168                 // alarm that will tell us when we have decided the device is
    169                 // truly idle.
    170                 final long nowElapsed = SystemClock.elapsedRealtime();
    171                 final long when = nowElapsed + INACTIVITY_IDLE_THRESHOLD;
    172                 if (DEBUG) {
    173                     Slog.v(TAG, "Scheduling idle : " + action + " now:" + nowElapsed + " when="
    174                             + when);
    175                 }
    176                 mScreenOn = false;
    177                 mAlarm.setWindow(AlarmManager.ELAPSED_REALTIME_WAKEUP,
    178                         when, IDLE_WINDOW_SLOP, mIdleTriggerIntent);
    179             } else if (action.equals(ACTION_TRIGGER_IDLE)) {
    180                 // idle time starts now. Do not set mIdle if screen is on.
    181                 if (!mIdle && !mScreenOn) {
    182                     if (DEBUG) {
    183                         Slog.v(TAG, "Idle trigger fired @ " + SystemClock.elapsedRealtime());
    184                     }
    185                     mIdle = true;
    186                     reportNewIdleState(mIdle);
    187                 }
    188             }
    189         }
    190     }
    191 
    192     @Override
    193     public void dumpControllerState(PrintWriter pw) {
    194         synchronized (mTrackedTasks) {
    195             pw.print("Idle: ");
    196             pw.println(mIdleTracker.isIdle() ? "true" : "false");
    197             pw.println(mTrackedTasks.size());
    198             for (int i = 0; i < mTrackedTasks.size(); i++) {
    199                 final JobStatus js = mTrackedTasks.get(i);
    200                 pw.print("  ");
    201                 pw.print(String.valueOf(js.hashCode()).substring(0, 3));
    202                 pw.println("..");
    203             }
    204         }
    205     }
    206 }
    207